NSN 4520-01-685-3985 · NIIN 016853985 · Part number 252A30-140 1
Watts Regulator Company · FSC 4520 — Space and Water Heating Equipment · FSG 45 — Plumbing, Heating, and Waste Disposal · CAGE 79227
Government record, cited
NSN 4520-01-685-3985 — this item is cataloged by the U.S. Government under National Stock Number 4520-01-685-3985. Manufacturer of record part number: 252A30-140 1.
Also searched as4520-01-685-3985 ·
4520016853985 ·
NIIN 016853985 ·
01-685-3985 ·
FSC 4520 Space and Water Heating Equipment · CAGE 79227 · 252A30-140 1
Operating Pressure: 300.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM LBS
Valve Type: STEAM RADIATOR AIR VENT
Material: COPPER ALLOY
1 manufacturer part number on file
Manufacturer of record: Watts Regulator Company
Identification
NSN: 4520-01-685-3985
NIIN: 016853985
FSC: 4520 — Space and Water Heating Equipment
FSG: 45 — Plumbing, Heating, and Waste Disposal
Primary part number: 252A30-140 1
Manufacturer: Watts Regulator Company
General Description
The Valve,air Venting,steam, cataloged under National Stock Number 4520-01-685-3985, is classified within Federal Supply Class 4520 (Space and Water Heating Equipment) of the Plumbing, Heating, and Waste Disposal group. The manufacturer of record is Watts Regulator Company. Government technical data includes 4 specifications, cited from the U.S. Government catalog. The record lists 1 manufacturer part number for this item, enabling identification through both NSN and commercial part number lookups. Current acquisition status: Active.
Other items in FSC 4520 — Space and Water Heating Equipment
Items in the same Federal Supply class. No interchangeability or substitution relationship is implied.
4520-00-000-0098
HEATING ELEMENT,ELECTRICAL,NONIM
4520-00-000-0099
4520-00-000-0099 · Item name not on file
4520-00-001-1240
4520-00-001-1240 · Item name not on file
4520-00-001-3518
HEATING ELEMENT,ELECTRICAL,NONIM
4520-00-001-3519
HEATING ELEMENT,ELECTRICAL,IMMER
4520-00-001-6052
HEATING ELEMENT,ELECTRICAL,NONIM
4520-00-001-6298
HEATING ELEMENT,ELECTRICAL,NONIM
4520-00-001-7726
HEATER,DUCT TYPE,PORTABLE
Frequently Asked Questions
What is NSN 4520-01-685-3985?
NSN 4520-01-685-3985 is a Valve,air Venting,steam, manufactured by Watts Regulator Company, classified under FSC 4520, Space and Water Heating Equipment. Status: active.
What part numbers are listed for NSN 4520-01-685-3985?
NSN 4520-01-685-3985 has 1 manufacturer part number on file: 252A30-140 1 (Watts Regulator Company).
What are the specifications of 252A30-140 1?
Key specifications for 252A30-140 1: Valve Connection Size: 1.0 INCHES IN; Operating Pressure: 300.0 POUNDS PER SQUARE INCH (PSI) MAXIMUM LBS; Valve Type: STEAM RADIATOR AIR VENT; Part Name Assigned by Controlling Agency: STEAM PRESSURE REGULATOR. 4 specifications are documented in the U.S. Government catalog.
Is NSN 4520-01-685-3985 hazardous material?
No hazard code in the DLA record (HMIC N). Hazard information on this page is shown exactly as it appears in the DLA record.
Sources
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-16.
U.S. Government catalog: edition PUBLOGDVD v12.0.0 (OCT 2026), edition date 2026-10-01, retrieved 2026-10-18.
✓ Data cited from the U.S. Government catalog; commercial cross-references from OEM and certified industry sources.